Bluegill in my experience are inactive at night. I have netted them out of a lake at night (for catfish bait) using a light, and they just sit still and get netted.
I don't think they will feed at night.
BG feed heavily at dusk and dawn in summer though.
Herons are not active in low light, so dusk is a good time to feed, if you can keep resetting your timer as the time of dusk gets earlier as summer goes on after June 21.
